this was much cheaper in japan. IIRC, 882 yen for a pack of 4 (compared to sg where it is $24.90!) so i didnt have to think twice before i picked it up to try.
i think generally the entire range is cheaper (and they also had the anti aging gold range too) in japan and can easily be found at matsumoto kiyoshi. i wanted to pick more up (like the serum, but i couldnt remember which!)
no english instructions so it's mostly guessing and memory work but i think you are supposed to leave it on for 3-5min. i leave it on for 10min plus coz it's so ex :p
the mask is quite thick but fits very well, has cut outs around the eyes (first mask i have seen that has that!) to ensure it fits well and eye flaps too.
after 10min, i didnt see any apparent whitening or brightening... my beauty diary's birds nest, black pearl or white pearl gives a much more obvious whitening effect for me but i leave them on for much longer. i am glad i didnt pay that much for it & satisfied my curiousity in trying it.
review for the moist charge mask coming up soon. using it now and hubs said i smell good. weird.